Respuesta :
Answer:
125°
Step-by-step explanation:
a+b+c=180° (sum of a triangle is 180°
40°+15°+x = 180°
55°+x = 180°
x = 180°-55°
=125°
What type of angle does X look like if it is 180 then the answer is 125 if the angle in 360 then the answer is 305